Also, consider the lenders lending options as some will require interest only monthly payments for the period that you have he loan and others will set you up with a balloon payment. 

Just as a reminder in addition to the interest rate, amortization schedule and fixed period of the loan, inquire about: 1) Prepayment Penalties (In case you want to refinance in a few years), 2) Possibility of Rehab Funding, 3) Reserve Requirements, 4) Personal Guarantees, 4) Rate Adjustments (i.e. at the 5 year mark) to understand other variables in the loan product that works best for your project.

If you ignore them, are you prepared to have them upset at you for an indefinite period of time?

This is in Allentown, PA I was reading about the rent increases and from what I saw it cannot be raised more than 10% in 12-month period.  

Take a trial of all 3 and see which one works best for you. 

Standard contract contingencies may include an inspection period, financing contingency and appraisal contingency.4.

They’ll pry want to know if it was a property tax sale where she gets a lien, if there’s a redemption period, a foreclosure auction, etc. 

Period. 

just be cautious when it comes to using these. ensure you've got a plan to pay that balance back in a relatively quick fashion as most HELOC rates can fluctuate which could make the numbers suddenly not work. i've leveraged mine in instances where i'm doing a BRRR and i want the deposit for a private money loan. i'm not using it as my downpayment and leaving it out there for a long period of time. 

I finished my 30 day trial on it.